diff --git a/example.py b/example.py
index ce3ed26..ec70d95 100644
--- a/example.py
+++ b/example.py
@@ -1,5 +1,9 @@
+import time
 from xtendr.xtendrsystem import XtendRSystem
 
+def my_callback():
+    print("'example_plugin is finished pre-loading")
+    
 if __name__ == "__main__":
     """Example usage of the PluginSystem.
     
@@ -15,7 +19,10 @@ if __name__ == "__main__":
     Detached plugin 'example_plugin'.
     """
     system = XtendRSystem()
-    system.attach("example_plugin")  # Assuming 'example_plugin/plugin_info.json' exists
+    system.attach("example_plugin", my_callback)  # Assuming 'example_plugin/plugin_info.json' exists
+    for i in range(3):
+        print(f"Main program is running iteration {i+1}...")
+        time.sleep(2)
     system.run("example_plugin", test="Hello!")
     system.stop("example_plugin")
     system.run("example_plugin", 25)
diff --git a/plugins/example_plugin/example_plugin.py b/plugins/example_plugin/example_plugin.py
index 0dbef91..5524d68 100644
--- a/plugins/example_plugin/example_plugin.py
+++ b/plugins/example_plugin/example_plugin.py
@@ -1,3 +1,5 @@
+import threading
+import time
 from xtendr.xtendrbase import XtendRBase
 
 class ExamplePlugin(XtendRBase):
@@ -31,3 +33,7 @@ class ExamplePlugin(XtendRBase):
     
     def stop(self):
         print("ExamplePlugin has stopped!")
+
+    def pre_load(self, callback):
+        time.sleep(5) # Indicate long running pre-load.
+        callback()
diff --git a/setup.py b/setup.py
index 302cc2b..a07cced 100644
--- a/setup.py
+++ b/setup.py
@@ -3,7 +3,7 @@ if __name__ == "__main__":
     
     setup(
         name="XtendR",
-        version="0.2.1",
+        version="0.3.2",
         packages=find_packages(),
         install_requires=[],
         author="Jan Lerking",
diff --git a/xtendr/xtendrbase.py b/xtendr/xtendrbase.py
index d5c9234..3a85940 100644
--- a/xtendr/xtendrbase.py
+++ b/xtendr/xtendrbase.py
@@ -23,3 +23,8 @@ class XtendRBase(ABC):
     @abstractmethod
     def stop(self):
         pass
+
+    @abstractmethod
+    def pre_load(self, *args):
+        pass
+        
\ No newline at end of file
diff --git a/xtendr/xtendrsystem.py b/xtendr/xtendrsystem.py
index b6de8ef..e01cef4 100644
--- a/xtendr/xtendrsystem.py
+++ b/xtendr/xtendrsystem.py
@@ -2,9 +2,10 @@ import importlib
 import sys
 import os
 import json
+import threading
 from xtendr.xtendrbase import XtendRBase
 
-__version__ = "0.1.3"
+__version__ = "0.3.2"
 
 class XtendRSystem:
     """Plugin system to manage plugins.
@@ -28,7 +29,7 @@ class XtendRSystem:
     def version(self) -> str:
         return "XtendR v" + __version__
     
-    def attach(self, name: str) -> None:
+    def attach(self, name: str, callback) -> None:
         """Dynamically load a plugin from its folder."""
         if name in self.plugins:
             print(f"Plugin '{name}' is already attached.")
@@ -67,6 +68,9 @@ class XtendRSystem:
                     'autorun': False
                 }
                 print(f"Attached plugin '{name}'.")
+                print(f"Running pre-load on '{name}'.")
+                thread = threading.Thread(target=self.plugins[name]['instance'].pre_load, args=(callback,))
+                thread.start()
         except (ModuleNotFoundError, json.JSONDecodeError, AttributeError) as e:
             print(f"Failed to attach plugin '{name}': {e}")